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Fault Code 38 - I'm lost and in need of urgent Help!
Well, my Cavalier Turbo 4x4 is having a wee issue. Basically.....if you drive the car all is well, but put it under load and the EML comes on. When I flash out the codes I get code 38, Oxygen Sensor - Voltage Low. I have changed the Fuel pump relay, checked all the wiring, checked the earths.....all seems when, I bought a brand new sensor.
Well the fuel pump relay didnt solve anything, but it was a shot in the dark as Vaux said. It can cause an error code 38.
Anyways, I have been doing some investigating chaps and found out some interesting information. I followed Ritches guide that explains how to test your O2 sensor.
The procedure is thus:
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Start Engine
Measure the voltage between the brown (earth wire) and the brown/blue wire.
Should be between
0.1v (LEAN) &
0.9v (RICH)
The voltage between the other wire (white/black or red/blue) and ground should be approx 13v for the heating element.
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Thats all fine and dandy, so I went and tested my plug in the above manor, now what i got was interesting. The white / black wire gave me the expected 13v or there abouts which was fine, however, the voltage between the brown (earth wire) and the brown/blue.......was nothing atall......I'm using an analog multimetre, but the needle doesnt even twitch.
So ....um........ whats the best way forward with something like that?? Anyone know?
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Originally Posted by Teknobry 
